How do I apply color with Cycles Material Nodes with No UV?
Nodes using Generated Coordinates

No UV



Nodes Use Generated X Coordinates.  Image above.    Cleanup Pending. We think these are better attached to vertices and survive rotation as the image shows a translated and rotated lemon. See axis orientation.  Please test and confirm.  Artistry not considered.

Please improve these nodes.  

Deprecated Nodes of Lemon Quality abusing the X position of fragment.



Cycles Render.  Less Green.  X Coordinate used. Object Centered at Origin.  Image Above.  Keeping some old nodes until cleanup.



More Green.  Nodes showing use of X Coordinate.  Left and Right value made equal via Absolute Value Node.  

The Multiplication node controls the spread.  Its value is keyframed.

Do not eat lemons like this.